/*
 * Copyright 2008 The Apache Software Foundation Licensed under the Apache
 * License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law
 * or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

package org.apache.ibatis.ibator.generator.ibatis2.dao.elements;

import java.util.Set;
import java.util.TreeSet;

import org.apache.commons.lang.StringUtils;
import org.apache.ibatis.ibator.api.DAOMethodNameCalculator;
import org.apache.ibatis.ibator.api.IntrospectedColumn;
import org.apache.ibatis.ibator.api.dom.java.FullyQualifiedJavaType;
import org.apache.ibatis.ibator.api.dom.java.Interface;
import org.apache.ibatis.ibator.api.dom.java.JavaVisibility;
import org.apache.ibatis.ibator.api.dom.java.Method;
import org.apache.ibatis.ibator.api.dom.java.Parameter;
import org.apache.ibatis.ibator.api.dom.java.PrimitiveTypeWrapper;
import org.apache.ibatis.ibator.api.dom.java.TopLevelClass;

/**
 * @author Jeff Butler
 */
public class InsertMethodGenerator extends AbstractDAOElementGenerator
{

	public InsertMethodGenerator()
	{
		super();
	}

	@Override
	public void addImplementationElements(TopLevelClass topLevelClass)
	{
		Set<FullyQualifiedJavaType> importedTypes = new TreeSet<FullyQualifiedJavaType>();
		Method method = getMethodShell(importedTypes);

		FullyQualifiedJavaType returnType = method.getReturnType();

		StringBuilder sb = new StringBuilder();

		if (returnType != null)
		{
			sb.append("Object newKey = "); //$NON-NLS-1$
		}

		sb.append(daoTemplate.getInsertMethod(
				introspectedTable.getIbatis2SqlMapNamespace(),
				introspectedTable.getInsertStatementId(),
				StringUtils.uncapitalize(introspectedTable.getRules()
						.calculateAllFieldsClass().getShortName()))); //$NON-NLS-1$
		method.addBodyLine(sb.toString());

		if (returnType != null)
		{
			if ("Object".equals(returnType.getShortName())) { //$NON-NLS-1$
				// no need to cast if the return type is Object
				method.addBodyLine("return newKey;"); //$NON-NLS-1$
			}
			else
			{
				sb.setLength(0);

				if (returnType.isPrimitive())
				{
					PrimitiveTypeWrapper ptw = returnType
							.getPrimitiveTypeWrapper();
					sb.append("return (("); //$NON-NLS-1$
					sb.append(ptw.getShortName());
					sb.append(") newKey"); //$NON-NLS-1$
					sb.append(")."); //$NON-NLS-1$
					sb.append(ptw.getToPrimitiveMethod());
					sb.append(';');
				}
				else
				{
					sb.append("return ("); //$NON-NLS-1$
					sb.append(returnType.getShortName());
					sb.append(") newKey;"); //$NON-NLS-1$
				}

				method.addBodyLine(sb.toString());
			}
		}

		if (ibatorContext.getPlugins().daoInsertMethodGenerated(method,
				topLevelClass, introspectedTable))
		{
			topLevelClass.addImportedTypes(importedTypes);
			topLevelClass.addMethod(method);
		}
	}

	@Override
	public void addInterfaceElements(Interface interfaze)
	{
		Set<FullyQualifiedJavaType> importedTypes = new TreeSet<FullyQualifiedJavaType>();
		Method method = getMethodShell(importedTypes);
		addMethodComment(method, "save pojo");
		if (ibatorContext.getPlugins().daoInsertMethodGenerated(method,
				interfaze, introspectedTable))
		{
			interfaze.addImportedTypes(importedTypes);
			interfaze.addMethod(method);
		}
	}

	private Method getMethodShell(Set<FullyQualifiedJavaType> importedTypes)
	{
		Method method = new Method();

		FullyQualifiedJavaType returnType;
		if (introspectedTable.getGeneratedKey() != null)
		{
			IntrospectedColumn introspectedColumn = introspectedTable
					.getColumn(introspectedTable.getGeneratedKey().getColumn());
			if (introspectedColumn == null)
			{
				// the specified column doesn't exist, so don't do the generated
				// key
				// (the warning has already been reported)
				returnType = null;
			}
			else
			{
				returnType = introspectedColumn.getFullyQualifiedJavaType();
				importedTypes.add(returnType);
			}
		}
		else
		{
			returnType = null;
		}

		method.setReturnType(returnType);
		method.setVisibility(JavaVisibility.PUBLIC);
		DAOMethodNameCalculator methodNameCalculator = getDAOMethodNameCalculator();
		method.setName(methodNameCalculator
				.getInsertMethodName(introspectedTable));

		FullyQualifiedJavaType parameterType = introspectedTable.getRules()
				.calculateAllFieldsClass();

		importedTypes.add(parameterType);
		method.addParameter(new Parameter(parameterType, StringUtils
				.uncapitalize(parameterType.getShortName()))); //$NON-NLS-1$

		for (FullyQualifiedJavaType fqjt : daoTemplate.getCheckedExceptions())
		{
			method.addException(fqjt);
			importedTypes.add(fqjt);
		}

		ibatorContext.getCommentGenerator().addGeneralMethodComment(method,
				introspectedTable);

		return method;
	}
}
